Preheat the oven to 390 ℉ (200 ℃).
In a large bowl, mix all the dry ingredients: flour, baking powder, baking soda, salt, cinnamon, nutmeg, and sugar. Add the chocolate and mix again.
Grate in the butter mixing occasionally. Add the buttermilk and mix the dough with a fork forming large crumbs (there will be wet and dry spots, this is fine).
Transfer the dough to a working surface and shape it into a rectangle pressing with your hands. The rectangle should be roughly 1 to 1¼ inch thick. Cut the rectangle into six squares and place them on a baking tray leaving some space between them. (If you prefer, you can cut each square into 2 triangles)
Brush the top of the scones with a bit of buttermilk and sprinkle some sugar on top if you wish. Put the baking tray in the oven and bake for 25 minutes or until they are done.
